Open .REM file Extension

The error "There is no application set to open the document." is a common problem faced by millions of Mac users daily. This happens either because the required app to open that file does not exist or there might be some malicious apps tempering your Mac

.RE

What is .REM file?

File stored on a BlackBerry smartphone; may be one of several different file types, but uses an ".rem" extension to indicate the file has been encrypted; often has a compound file extension, such as ".jpg.rem," which would be an encrypted JPEG image file.
REM files can only be decrypted on a BlackBerry phone. You can turn off encryption by navigating to Options ? Advanced ? Media Card ? Encrypt Media Files and then choosing "no." Once encryption is turned off, then you can transfer files to a computer and open them normally.
NOTE: REM files may be transferred to a computer using RIM's BlackBerry software, but cannot be opened directly on a Mac or PC.